mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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297 lines
8 KiB
C
297 lines
8 KiB
C
/*
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* GStreamer
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* Copyright (C) 2015 Matthew Waters <matthew@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstglelements.h"
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#include "gstglsrcbin.h"
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GST_DEBUG_CATEGORY (gst_debug_gl_src_bin);
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#define GST_CAT_DEFAULT gst_debug_gl_src_bin
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static void gst_gl_src_bin_finalize (GObject * object);
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static void gst_gl_src_bin_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * param_spec);
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static void gst_gl_src_bin_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * param_spec);
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static GstStateChangeReturn gst_gl_src_bin_change_state (GstElement * element,
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GstStateChange transition);
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static GstStaticPadTemplate gst_gl_src_bin_template =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/x-raw(ANY)"));
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enum
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{
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PROP_0,
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PROP_SRC,
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};
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enum
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{
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SIGNAL_0,
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SIGNAL_CREATE_ELEMENT,
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SIGNAL_LAST,
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};
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static guint gst_gl_src_bin_signals[SIGNAL_LAST] = { 0, };
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#define gst_gl_src_bin_parent_class parent_class
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G_DEFINE_TYPE_WITH_CODE (GstGLSrcBin, gst_gl_src_bin,
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GST_TYPE_BIN,
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GST_DEBUG_CATEGORY_INIT (gst_debug_gl_src_bin, "glsrcbin", 0,
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"OpenGL Video Src Bin"));
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GST_ELEMENT_REGISTER_DEFINE_WITH_CODE (glsrcbin, "glsrcbin",
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GST_RANK_NONE, GST_TYPE_GL_SRC_BIN, gl_element_init (plugin));
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static void
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gst_gl_src_bin_class_init (GstGLSrcBinClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *element_class;
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gobject_class = (GObjectClass *) klass;
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element_class = GST_ELEMENT_CLASS (klass);
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element_class->change_state = gst_gl_src_bin_change_state;
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gobject_class->set_property = gst_gl_src_bin_set_property;
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gobject_class->get_property = gst_gl_src_bin_get_property;
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gobject_class->finalize = gst_gl_src_bin_finalize;
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g_object_class_install_property (gobject_class, PROP_SRC,
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g_param_spec_object ("src",
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"GL src element",
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"The GL src chain to use",
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GST_TYPE_ELEMENT,
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GST_PARAM_MUTABLE_READY | G_PARAM_READWRITE |
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G_PARAM_STATIC_STRINGS));
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/**
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* GstGLSrcBin::create-element:
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* @object: the #GstGLSrcBin
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*
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* Will be emitted when we need the processing element/s that this bin will use
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*
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* Returns: a new #GstElement
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*/
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gst_gl_src_bin_signals[SIGNAL_CREATE_ELEMENT] =
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g_signal_new ("create-element", G_TYPE_FROM_CLASS (klass),
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G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, GST_TYPE_ELEMENT, 0);
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gst_element_class_set_metadata (element_class,
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"GL Src Bin", "Src/Video",
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"Infrastructure to process GL textures",
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"Matthew Waters <matthew@centricular.com>");
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gst_element_class_add_static_pad_template (element_class,
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&gst_gl_src_bin_template);
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}
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static void
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gst_gl_src_bin_init (GstGLSrcBin * self)
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{
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gboolean res = TRUE;
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GstPad *pad;
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self->download = gst_element_factory_make ("gldownload", NULL);
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self->convert = gst_element_factory_make ("glcolorconvert", NULL);
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res &= gst_bin_add (GST_BIN (self), self->download);
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res &= gst_bin_add (GST_BIN (self), self->convert);
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res &= gst_element_link_pads (self->convert, "src", self->download, "sink");
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pad = gst_element_get_static_pad (self->download, "src");
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if (!pad) {
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res = FALSE;
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} else {
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GST_DEBUG_OBJECT (self, "setting target src pad %" GST_PTR_FORMAT, pad);
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self->srcpad = gst_ghost_pad_new ("src", pad);
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gst_element_add_pad (GST_ELEMENT_CAST (self), self->srcpad);
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gst_object_unref (pad);
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}
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if (!res) {
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GST_WARNING_OBJECT (self, "Failed to add/connect the necessary machinery");
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}
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}
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static void
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gst_gl_src_bin_finalize (GObject * object)
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{
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GstGLSrcBin *self = GST_GL_SRC_BIN (object);
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if (self->src)
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gst_object_unref (self->src);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static gboolean
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_connect_src_element (GstGLSrcBin * self)
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{
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gboolean res = TRUE;
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gst_object_set_name (GST_OBJECT (self->src), "src");
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res &= gst_bin_add (GST_BIN (self), self->src);
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res &= gst_element_link_pads (self->src, "src", self->convert, "sink");
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if (!res)
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GST_ERROR_OBJECT (self, "Failed to link src element into the pipeline");
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return res;
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}
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/*
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* @src: (transfer floating):
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*/
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static gboolean
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gst_gl_src_bin_set_src (GstGLSrcBin * self, GstElement * src)
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{
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g_return_val_if_fail (GST_IS_ELEMENT (src), FALSE);
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if (self->src) {
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gst_element_set_locked_state (self->src, TRUE);
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gst_bin_remove (GST_BIN (self), self->src);
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gst_element_set_state (self->src, GST_STATE_NULL);
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gst_object_unref (self->src);
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self->src = NULL;
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}
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self->src = src;
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gst_object_ref_sink (src);
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if (src && !_connect_src_element (self)) {
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gst_object_unref (self->src);
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self->src = NULL;
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return FALSE;
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}
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return TRUE;
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}
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void
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gst_gl_src_bin_finish_init_with_element (GstGLSrcBin * self,
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GstElement * element)
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{
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gst_gl_src_bin_set_src (self, element);
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}
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void
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gst_gl_src_bin_finish_init (GstGLSrcBin * self)
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{
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GstGLSrcBinClass *klass = GST_GL_SRC_BIN_GET_CLASS (self);
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GstElement *element = NULL;
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if (klass->create_element)
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element = klass->create_element ();
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if (element)
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gst_gl_src_bin_finish_init_with_element (self, element);
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}
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static void
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gst_gl_src_bin_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstGLSrcBin *self = GST_GL_SRC_BIN (object);
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switch (prop_id) {
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case PROP_SRC:
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gst_gl_src_bin_set_src (self, g_value_get_object (value));
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break;
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default:
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if (self->src)
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g_object_set_property (G_OBJECT (self->src), pspec->name, value);
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break;
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}
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}
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static void
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gst_gl_src_bin_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstGLSrcBin *self = GST_GL_SRC_BIN (object);
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switch (prop_id) {
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case PROP_SRC:
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g_value_set_object (value, self->src);
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break;
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default:
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if (self->src)
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g_object_get_property (G_OBJECT (self->src), pspec->name, value);
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break;
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}
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}
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static GstStateChangeReturn
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gst_gl_src_bin_change_state (GstElement * element, GstStateChange transition)
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{
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GstGLSrcBin *self = GST_GL_SRC_BIN (element);
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GstGLSrcBinClass *klass = GST_GL_SRC_BIN_GET_CLASS (self);
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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GST_DEBUG ("changing state: %s => %s",
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gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
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gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
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switch (transition) {
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case GST_STATE_CHANGE_NULL_TO_READY:
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if (!self->src) {
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if (klass->create_element)
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self->src = klass->create_element ();
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if (!self->src) {
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g_signal_emit (element,
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gst_gl_src_bin_signals[SIGNAL_CREATE_ELEMENT], 0, &self->src);
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if (self->src && g_object_is_floating (self->src))
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gst_object_ref_sink (self->src);
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}
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if (!self->src) {
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GST_ERROR_OBJECT (element, "Failed to retrieve element");
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return GST_STATE_CHANGE_FAILURE;
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}
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if (!_connect_src_element (self))
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return GST_STATE_CHANGE_FAILURE;
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}
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break;
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE)
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return ret;
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switch (transition) {
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default:
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break;
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}
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return ret;
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}
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